diff --git a/be/src/runtime/workload_management/io_throttle.h b/be/src/runtime/workload_management/io_throttle.h
index ce62c65d7a..4212527020 100644
--- a/be/src/runtime/workload_management/io_throttle.h
+++ b/be/src/runtime/workload_management/io_throttle.h
@@ -47,7 +47,7 @@ private:
     std::mutex _mutex;
     std::condition_variable wait_condition;
     int64_t _next_io_time_micros {0};
-    std::atomic<int64_t> _io_bytes_per_second_limit {10485760};
+    std::atomic<int64_t> _io_bytes_per_second_limit {-1};
 
     // bvar monitor
     std::unique_ptr<bvar::Adder<size_t>> _io_adder;